Repairable or not?

[Mr-B]

My e46 led tail cluster has some non working led's, I think there was a guy on a forum that had fixed them with a DIY repair using bits from a local shop, has anyone here tried a DIY repair or know of a place that repairs them? Don't fancy shelling out big £££'s for a replacement.

Also I vaguely recall that it may be due to a poor earth problem, have I dreamt this or is this something else to look into?

Sorry for poor pic it was chucking it down.